If you receive an Old Age Pension from the UK and live in France, or I presume another EU country with a double taxation agreement with the UK, you can opt to have the pension taxed in your country of residence and not pay UK tax on it. I am speaking for France and I have just received a refund from the tax office in the UK of all the tax I paid since I started to receive the pension, not only that but the French allowances mean that I do not pay tax in France either. Well worth looking into.
The site to visit and download the necessary forms from is click here
The red tape is getting easier to get through and as for the language there are more and more French people learning English. Most of the large firms and organisations are arranging for their employees to have lessons. My area has the first English speaking section in the tax office!
Of course you have to adopt a positive attitude, then you will get on OK, nothing magic about it. If you do think about retiring here I would be willing to help where I can.